Has anybody had issues with RCBS dies being out of spec? I have a 26 Nosler that after running through the RCBS dies, the shoulder actually gets longer. Press cams over so there is no way to get the shoulder bump. Had a friend run my once fired brass through his dies and get a perfect 2 thou shoulder bump (like I was expecting). Called RCBS and they act like every die they ever made brings it back to SAMMI spec and my chamber is the issue. Anybody have thoughts on this?
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RCBS out of spec
- Thread starter ironsights
- Start date
Have had this issue with 257 AI and 25-06 AI redding dies… grind the shell holder down or get some Redding competiton shells holders and give it a whirl
Redding competition shell holders will NOT give you more shoulder bump. They work the opposite direction. They give you less bump.
For getting more shoulder bump, you will need to grind off a few thousandths off of a shell holder or off of the bottom of the die.
For getting more shoulder bump, you will need to grind off a few thousandths off of a shell holder or off of the bottom of the die.
In a pinch situation... where you are not in a well equipped shop.... here is a suggestion to think about.
If you own the GoGage... gut the die and place the go gage into it, then measure how far the base of the gage protrudes from the bottom of the die. Since the nominal height of a shell plate is supposed to be 0.125", we can tell how much potential bump there would be by the stick-out of the gage.
If the gage doesn't stick out beyond 0.125" then the die is out of spec but can be remedied by a grind to remove enough material to get the bump you need.
Another method is to take a Cerro-Safe casting of the gutted die and allow enough extra material to mushroom on the end to locate the end of the die body, then take a measurement from the base of the die to the headspace datum.
You have to have some skills and at least a caliper to nail this method down because you are trying to resolve a value that is on the order of less than 0.010".
If you own the GoGage... gut the die and place the go gage into it, then measure how far the base of the gage protrudes from the bottom of the die. Since the nominal height of a shell plate is supposed to be 0.125", we can tell how much potential bump there would be by the stick-out of the gage.
If the gage doesn't stick out beyond 0.125" then the die is out of spec but can be remedied by a grind to remove enough material to get the bump you need.
Another method is to take a Cerro-Safe casting of the gutted die and allow enough extra material to mushroom on the end to locate the end of the die body, then take a measurement from the base of the die to the headspace datum.
You have to have some skills and at least a caliper to nail this method down because you are trying to resolve a value that is on the order of less than 0.010".
